Cylinder mounting means for rotary sheet printing presses



April 30, 1957 G. KALDscHMlD-r 2,790,335

CYLINDER MOUNTING MEANS FOR ROTARY SHEET PRINTING PRESSES, I

Filed May 14, 1953 3 Sheets-Sheet 1 pl'il 30, 1957 G. KALDscHMlDT2,790,385 CYLINDER MOUNTING MEANS FOR ROTARY SHEET PRINTING PRESSES lFiled May 14, 1953 3 Sheets-Sheet 2 April 30, 1957 G. KALDscHMlDT2,790,385

CYLINDER MOUNTING MEANS FOR ROTARY SHEET PRINTING PRESSES Filed may 14,195s 3 Sheets-Sheet 3 INVENTOR.

United Sta-tes Parent' CYLINDER MOUNTING MEANS FOR ROTARY SHEET PRINTINGPRESSES Georg Kaldschmidt, Dresden-Weisser-Hirsch, Germany, assignor toVEB Druckmaschinenwerk Victoria, VVB Polygraph, Heidenau, Saxony,Germany Application May 14, 1953, Serial No. 355,017

2 Claims. (Cl. 101-232) This invention relates to a rotary sheetprinting press for letterpress work, particularly designed for printingon one side only, but adapted also for perfect yand multicolor printing.

In rotary printing presses provided with a plurality of printingmechanisms arranged one after another it is known to drive each of themindividually from the main shaft extending horizontally along all thesemechanisms.

The invention proposes a different arrangement the novel feature ofwhich is that the printing mechanism as well as the delivery device of arotary sheet printing press for letterpress work are each separatelydriven from the main shaft. Owing to this arrangement, the moving massesof the main driving members can be of lighter construction to insuresteady running of the press as required for producing high-gradeprinting work. Furthermore, after releasing the fingers in case ofincorrect feeding it is possible to throw oi impression by slightlyswinging the impression cylinder away from the plate cylinder.

This swinging motion is known of course in presses, but in the knownpresses the printing cylinder driven together with the plate cylinderand the delivery drum by the same drive has to be lowered at least mm.to .throw olf impression, provided the plate cylinder with inkingrollers set going and the delivery drum with its chains cooperate in arolling motion. Considerable power is needed to overcome the frictiondeveloping for throwing off impression in this way.

These drawbacks are avoided by employing separate drives for the platecylinders with impression cylinders and for the delivery drum. In thepress according to the invention the entire throw-off mechanism operateseasily, because the impression cylinder, without much expenditure ofpower, merely swings down toward the delivery drum. In a particularlyadvantageous constructional form of the invention the main shaft drivenby a motor via a worm gear extends in vertical direction and, by way ofa bevel gear system, separately drives the intermediate shafts for thedelivery means, the printing mechanism and the inking apparatus ifnecessary.

All structural members may be kept small, since the stressing momentsare small also.

On the shaft of the impression cylinder a stepped gear driven by thecorresponding intermediate shaft is disposed with its angle of skewopposite to that of the driving gear of the impression cylinder. As thestepped gear is in mesh with the driving gear of the plate cylinder,axial thrust of the impression cylinder is eliminated.

Compared with known constructions, the printing mechanism driveaccording to the invention produces also a more elastic braking effect.This elasticity, however, cannot lower the quality of the print, sincethe plate cylinder is driven directly by the impression cylinder.

In the drawing,

Figure 1 is a diagrammatic side view of the main drive;

2,790,385 Patented Apr. 30, 1957 vCC 2 Fig. 2, a diagrammatic front Viewof the main drive with a view of the cylinders;

Fig. 3, a diagrammatic view of the customary way of throwing off theimpression cylinder from the plate cylinder; and

Fig. 4 shows diagrammatically the throwing oi of the impression bycausing the impression cylinder to beswung away from the plate cylinderaccording to the invention.

The rotary sheet printing press possesses a frame 1 for the reception ofthe inking apparatus 2, the printing mechanism 3 and the delivery means4. The printing mechanism 3 includes the impression cylinder 5 and theplate cylinder 6 which is in contact with the rollers of the inkingapparatus 2.

The sheets coming from the feeding device are guided by way of thefeeding table 7 to the gauges 8 and are aligned by the lateraldisplacement means 9. After alignment a sheet is engaged by the grippingmeans 10 and delivered to the impression cylinder 5. In case of improperfeeding the fingers 11 begin to act.

The printing mechanism 3 and the delivery means 4 are driven via thevertical main shaft 12, worm 13 and worm gear 14 by the motor 15 (Fig.l). On the main shaft 12 a spirally toothed bevel gear 16 is providedand in mesh with a spirally toothed bevel gear 18 keyed on theintermediate shaft 17 carrying a stepped gear 19 which by way of thestepped gears 20, 21 drives the delivery drum 22 (Fig. 2).

The main shaft 12 supports an additional spirally toothed bevel gear 23which by way of a spirally toothed bevel gear 24 and stepped gears 25,26 drives an intermediate shaft 27.

The impression cylinder 5 is driven by a pair of stepped gears 28, 29,arranged on the other side of the frame 1, through the intermediateshaft 27. The impression cylinder 5 is provided with a driving gear 30in mesh with a spur gear 31 of the plate cylinder 6. The gears 29, 30disposed on the shaft 32 of the impression cylinder 5 have an oppositeangle of skew whereby axial thrust at the impression cylinder 5 isremoved.

At the end of the main shaft 12 a bevel gear 33 (Fig. 1) meshes with acounter gear 35 on the intermediate shaft 34 which carries additionalbevel gears for driving the rollers of the inking apparatus 2.

The impression cylinder 5 is disposed in eccentric bushings which permita slight swinging motion of the impression cylinder 5 in the directionaway from the plate cylinder 6 and toward the delivery drum 22 in caseof incorrect feeding and response of the fingers 11.

The different conditions when throwing ol impression in existing drivesand in the drive according to the invention are indicated in Figs. 3 and4. While the impression cylinder 5 had to be moved hitherto aconsiderable distance about tangentially to the plate cylinder 6 and thedelivery drum 22 to obtain the free space between impression cylinderand plate cylinder for throwing off impression (Fig. 3), a much smallermovement of the impression cylinder radially to the plate cylinder 6will now be sufficient to provide the necessary clearance (Fig. 4).

I claim:

1. A rotary sheet printing press mechanism, compris- Y 3 ofsaid deliverydrum said-impression cylinder being movable awayy from said` platevcylinder towardsA -saiddef livery drum.

2. A mechanism as claimed in claim 1 wherein said power source comprisesa shaft and spaced gears onsaid shaft, said spaced gears bein'g coupled.respectively to.

said impression cylinder and` said deliver-ydrum, Asaid UNITED STATESPATENTS Terrey Apr. 17, 1923 Livingston Sept. 29, 1942 Crafts Apr. 13,1948 Riggs et al. Aug. 24, 1948 Goodwin Aug. 8, 1950 I-.Iuclcv et al. VMay 27, 1952 Brigham Sept. 9, 1952

